Use 

    Time.now + 10.days

or even

    10.days.from_now

Both definitely work. Are you sure you&#39;re in Rails and not just Ruby?

If you definitely are in Rails, where are you trying to run this from? Note that Active Support has to be loaded.

`days`, `years`, etc., are part of Active Support, So this won&#39;t work in `irb`, but it should work in `rails console`.

This definitely works and I use this wherever I need to add days to the current date:  

    Date.today + 5

Some other options, just for reference

    -10.days.ago
    # Available in Rails 4
    DateTime.now.days_ago(-10)

Just list out all options I know:

    [1] Time.now + 10.days
    [2] 10.days.from_now
    [3] -10.days.ago
    [4] DateTime.now.days_ago(-10)
    [5] Date.today + 10

So now, what is the difference between them if we care about the timezone:

 - `[1, 4]` With system timezone
 - `[2, 3]` With config timezone of your Rails app
 - `[5]` Date only no time included in result


 
   Try this on Rails

    Time.new + 10.days 

   Try this on Ruby

    require &#39;date&#39;
    DateTime.now.next_day(10).to_time



Try this on Ruby.
It will return a new date/time the specified number of days in the future

    DateTime.now.days_since(10)

I have an ImageView that has a drawable image resource set to a selector. How do I programmatically access the selector and change the images of the highlighted and non-highlighted state?

Here is a code of selector:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;selector xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot; android:id=&quot;@+id/iconSelector&quot;&gt;
      &lt;!-- pressed --&gt;
      &lt;item android:state_pressed=&quot;true&quot; android:drawable=&quot;@drawable/btn_icon_hl&quot; /&gt;
      &lt;!-- focused --&gt;
      &lt;item android:state_focused=&quot;true&quot; android:drawable=&quot;@drawable/btn_icon_hl&quot; /&gt;
      &lt;!-- default --&gt;
      &lt;item android:drawable=&quot;@drawable/btn_icon&quot; /&gt;
    &lt;/selector&gt;

I want to be able to replace `btn_icon_hl` and `btn_icon` with other images.

Replace selector images programmatically

This seems like something Python would have a shortcut for. I want to append an item to a list N times, effectively doing this:

    l = []
    x = 0
    for i in range(100):
        l.append(x)

It would seem to me that there should be an &quot;optimized&quot; method for that, something like:

    l.append_multiple(x, 100)

Is there?

Python: Append item to list N times

I tried doing something like 

    Time.now + 5.days

but that doesn&#39;t work, even though I vaguely remember seeing, and being very impressed, with being able to do something like `2.years` etc. 

How do I do that in Rails 3?


How to add 10 days to current time in Rails

I tried doing something like
<pre><code class="hljs language-css">Time.now + 5.days
</code></pre>
but that doesn't work, even though I vaguely remember seeing, and being very impressed, with being able to do something like <code>2.years</code> etc.
How do I do that in Rails 3?

I have a form where I collect a lot of information in Rails. Part of this form is fields for a new user to register. Since Devise has controllers/actions specifically to create a new user, I don&#39;t know how to programmatically create a user in an entirely different action that also creates another record. I really can&#39;t have the user registration form separate. I can&#39;t figure out how to create a user, and then log the user in, like I could easily do in Authlogic.

I have used both Authlogic and Devise, and think each has their strengths and weaknesses. With Devise, I love how quick it is to &quot;get going&quot; with a new project, but customizing it seems to be a pain. Authlogic had so many problems with Rails 3 a while back, that I switched to Devise. I&#39;m now working on a new project and get to start from scratch.

So I think there are 2 potential answers to this question: (a) how to do this in Devise, or (b) why I should just switch to Authlogic with Rails 3 instead.

How to manually create a new user and user session in Devise?

While learning Ruby I&#39;ve come across the &quot;=&gt;&quot; operator on occasion. Usually I see it in the form of 

    :symbol =&gt; value

and it *seems* to be used frequently when passing values to functions. What exactly is that operator called? What does it do/mean? Is it built into Ruby or is it something that different frameworks like Rails and DataMapper add to the symbol class? Is it only used in conjunction with the symbol class? Thanks.

In Ruby what does &quot;=&gt;&quot; mean and how does it work?

I was testing some DB entries in our production server in Rails Console where almost all the commands were producing a huge number of lines of output and causing the ssh channel to hang.

Is there a way to suppress the console/irb screenfuls?

How to suppress Rails console/irb outputs

Where can I find a list of data types that can be used in rails 3? (such as text, string, integer, float, date, etc.?) I keep randomly learning about new ones, but I&#39;d love to have a list I could easily refer to.

Rails 3 datatypes?

Dumb question but I have some lingering confusion of what, exactly, a &quot;resource&quot; is in Rails. The term is used everywhere but I get a funny feeling it might be being used rather loosely. It&#39;s referenced in the model, the controller and, quite literally, in `routes.rb`. 

Is it the specific route? For example, `map.resources` maps the 7 RESTful &quot;resources&quot;. So an example of *one* resource would be the call to, say, the `index` action of a particular class&#39;s controller?!?

Is it a reference to the whole page/object being retrieved? or perhaps, more narrowly, a database table? or the row being retreived?

Is it something else? 

Anyway, hopefully someone can set me straight...

What is a &quot;resource&quot; in Rails?

I&#39;m a bit of a rambler, but I&#39;ll try to keep this clear -

I&#39;m bored, so I&#39;m working on a **&quot;shoutbox&quot;**, and I&#39;m a little confused over one thing. I want to get the time that a message is entered, and I want to make sure I&#39;m getting the server time, or at least make sure I&#39;m not getting the local time of the user. I know it doesn&#39;t matter, since this thing won&#39;t be used by anyone besides me, but I want to be thorough. I&#39;ve looked around and tested a few things, and I think the only way to do this is to get the milliseconds since **January 1, 1970 00:00:00 UTC**, since that&#39;d be the same for everyone.

I&#39;m doing that like so:

    var time = new Date();
    var time = time.getTime();

That returns a number like `1294862756114`.

Is there a way to convert `1294862756114` to a more readable date, like `DD/MM/YYYY HH:MM:SS`?

So, basically, I&#39;m looking for JavaScript&#39;s equivalent of PHP&#39;s `date();` function.


Converting milliseconds to a date (jQuery/JavaScript)

I have a date variable: ``2011-01-15`` and I would like to get a boolean back if said date is within 3 days from TODAY. Im not quite sure how to construct this in Python. Im only dealing with date, not datetime.

My working example is a &quot;grace period&quot;. A user logs into my site and if the grace period is within 3 days of today, additional scripts, etc. are omitted for that user.

I know you can do some fancy/complex things in Python&#39;s date module(s) but Im not sure where to look.

Checking date against date range in Python

I have the following date in string format &quot;2011-29-01 12:00 am&quot; . Now I am trying to convert that to datetime format with the following code:

    DateTime.TryParse(dateTime, out dt); 

But I am alwayws getting dt as {1/1/0001 12:00:00 AM}  , Can you please tell me why ?  and how can I convert that string to date.

EDIT: I just saw everybody mentioned to use format argument. I will mention now that I can&#39;t use the format parameter  as I have some setting to select the custom dateformat what user wants, and based on that user is able to get the date in textbox in that format automatically via jQuery datepicker.

DateTime.TryParse issue with dates of yyyy-dd-MM format

&gt; **Possible Duplicate:**  
&gt; [how to convert date from yyyyMMdd format to mm-dd-yyyy fomrat](https://stackoverflow.com/questions/4712335/how-to-convert-date-from-yyyymmdd-format-to-mm-dd-yyyy-fomrat)  

&lt;!-- End of automatically inserted text --&gt;

I have a `string` which contains date in yyyyMMdd format. I want to convert that date into system date format using `ConvertTo.DateTime()` method or any other simple method.

    string value = &quot;19851231&quot;;  //yyyyMMdd
    
    DateTime dateTime = 1985/12/31;

Convert date yyyyMMdd to system.datetime format

I am trying to get the date portion of a datetime field. I know I can get it with date_format, but that returns a string or &quot;varchar&quot; field. How can I convert the result to date and not as varchar?

This is my query  returning the varchar:

    (Select Date_Format(orders.date_purchased,&#39;%m/%d/%Y&#39;)) As Date  

I tried several combinations from this question, but could not make it to work: 

https://stackoverflow.com/questions/4596457/mysql-query-format-date-on-output

Any help is appreciated.

Query to convert from datetime to date mysql

I installed all of my gems using bundler via the Gemfile. I thought (mistakenly) that if I deleted a gem from my Gemfile and ran &#39;bundle install&#39; that the deleted gems would be uninstalled. I&#39;ve looked at the bundler help file and, so far as I can tell, it does not have a way to uninstall gems. 

Do I just use gem uninstall x for everything? Is this going to confuse bundler?


What is the best way to uninstall gems from a rails3 project?

In `config/routes.rb`, I tried both:

    root :to =&gt; &#39;things#index&#39;, :as =&gt; &#39;things&#39;

and

    root :to =&gt; &#39;things#index&#39;


When I hit `http://localhost:3000/`, both approaches work, and nothing seems to be different.

What is the `:as` option used for?

:as in rails routes.rb

I have a loop like such:

    &lt;% @posts.each do |post| %&gt;
      &lt;% render middle %&gt;
    &lt;% end %&gt;

Then in my middle partial, how do I access the current post?


Pass a variable into a partial, rails 3?

I&#39;m having trouble converting a UTC `Time` or `TimeWithZone` to local time in Rails 3.

Say `moment` is some `Time` variable in UTC (e.g. `moment = Time.now.utc`). How do I convert `moment` to my time zone, taking care of DST (i.e. using EST/EDT)?

More precisely, I&#39;d like to printout &quot;Monday March 14, 9 AM&quot; if the time correspond to this morning 9 AM EDT and &quot;Monday March 7, 9 AM&quot; if the time was 9 AM EST last monday.

Hopefully there&#39;s another way?

**Edit**: [I first thought][1] that &quot;EDT&quot; should be a recognized timezone, but &quot;EDT&quot; is not an actual timezone, more like the state of a timezone. For instance it would not make any sense to ask for `Time.utc(2011,1,1).in_time_zone(&quot;EDT&quot;)`. It is a bit confusing, as &quot;EST&quot; **is** an actual timezone, used in a few places that do not use Daylight savings time and are (UTC-5) yearlong.


  [1]: https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/6574

Convert UTC to local time in Rails 3

So in Rails 3.2, ActiveSupport::Memoizable has been deprecated.

The message reads:

    DEPRECATION WARNING: ActiveSupport::Memoizable is deprecated and
    will be removed in future releases,simply use Ruby memoization
    pattern instead.

It refers to &quot;Ruby memoization pattern&quot; (singular) as if there&#39;s one pattern we should all know and refer to...

I presume they mean something like:

    def my_method
      @my_method ||= # ... go get the value
    end

or 
    
    def my_method
      return @my_method if defined?(@my_method)

      @my_method = # ... go get the value
    end

Is there something else I&#39;ve missed?

Content Type	Original Author	Original Content on Stackoverflow
Question	Yuval Karmi	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	gunn	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	Jonathan Julian	View Answer on Stackoverflow
Solution 3 - Ruby on-Rails	dj kaori	View Answer on Stackoverflow
Solution 4 - Ruby on-Rails	Hieu Pham	View Answer on Stackoverflow
Solution 5 - Ruby on-Rails	Rahul Patel	View Answer on Stackoverflow
Solution 6 - Ruby on-Rails	Ramyani	View Answer on Stackoverflow

How to add 10 days to current time in Rails

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Solution 3 - Ruby on-Rails

Solution 4 - Ruby on-Rails

Solution 5 - Ruby on-Rails

Solution 6 - Ruby on-Rails

Python: Append item to list N times

Replace selector images programmatically

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